The cast grew quite a bit larger through the years, but in its early days it featured (from left) Nicholas Brendon, Anthony Head, Sarah Michelle Gellar, Charisma Carpenter and Alyson Hannigan. This promotional photo was from 1997.

The cast grew quite a bit larger through the years, but in its early days it featured (from left) Nicholas Brendon, Anthony Head, Sarah Michelle Gellar, Charisma Carpenter and Alyson Hannigan. This promotional

Nicholas Brendon played Xander, another one of Buffy's friends. photo-15208552.179349 - |ucfirst

Unhappily, Brendon has struggled with personal demons since "Buffy." His struggles with addiction and repeated trips to rehab have been well publicized. This is a booking photo from Palm Springs, California, where he was arrested on domestic violence charges last October.

Unhappily, Brendon has struggled with personal demons since "Buffy." His struggles with addiction and repeated trips to rehab have been well publicized. This is a booking photo from Palm Springs, California,

Here he is visiting Johnny Carson on Feb. 13, 1987; this could have been for his role in Woody Allen's "Radio Days," or perhaps for the teen comedy "Can't Buy Me Love," which starred Patrick Dempsey as his older brother.

Here he is visiting Johnny Carson on Feb. 13, 1987; this could have been for his role in Woody Allen's "Radio Days," or perhaps for the teen comedy "Can't Buy Me Love," which starred Patrick Dempsey as his

Here's Green just last week, March 4, 2018. Now 44, he's doing a lot of voice work, including "Robot Chicken."

Here's Green just last week, March 4, 2018. Now 44, he's doing a lot of voice work, including "Robot Chicken."

Photo: Amanda Edwards/WireImage

Here's Green just last week, March 4, 2018. Now 44, he's...photo-15208531.179349 - |ucfirst

Eliza Dushku plays Faith, who initially stands on the side of good vs. evil with Buffy. She appears in both "Buffy" and "Angel."

Eliza Dushku plays Faith, who initially stands on the side of good vs. evil with Buffy. She appears in both "Buffy" and "Angel."

Photo: Jim Smeal/WireImage

Eliza Dushku plays Faith, who initially stands on the side of good...photo-15208525.179349 - |ucfirst

Dushku was yet another successful child actor. You might remember her as the daughter of Arnold Schwarzenegger and Jamie Lee Curtis in "True Lies." She recently said she was sexually abused by the stunt coordinator on that film when she was 12.

Dushku was yet another successful child actor. You might remember her as the daughter of Arnold Schwarzenegger and Jamie Lee Curtis in "True Lies." She recently said she was sexually abused by the stunt

Dushku still appears in the occasional film or TV episode. Here she is in 2017 playing an attorney on the CBS series "Bull." She's 37 now.

Dushku still appears in the occasional film or TV episode. Here she is in 2017 playing an attorney on the CBS series "Bull." She's 37 now.

Photo: CBS Photo Archive/CBS Via Getty Images

Dushku still appears in the occasional film or TV episode. Here...photo-15208523.179349 - |ucfirst

After the final episode wrapped in 2003, a party was held, with actors (from left) Tom Lenk, Emma Caulfield, Alexis Denisof, Alyson Hannigan and Anthony Stewart Head, producer Joss Whedon and actors Michelle Trachtenberg and James Marsters.

After the final episode wrapped in 2003, a party was held, with...photo-15208522.179349 - |ucfirst

Joss Whedon created the original "Buffy" film but wasn't happy with the way it went, so he jumped at the chance to recreate it for television. Here he is in 2001 at the age of 37.

Joss Whedon created the original "Buffy" film but wasn't happy with the way it went, so he jumped at the chance to recreate it for television. Here he is in 2001 at the age of 37.

Photo: Kevin Winter/Getty Images

Joss Whedon created the original "Buffy" film but...photo-15208520.179349 - |ucfirst

Whedon, seen here in November 2017, is now 53 and far more successful than when he created "Buffy." He has written, directed and/or produced any number of popular fantasy and sci-fi titles for both film and TV, including "Firefly"/"Serenity," "Agents of S.H.I.E.L.D." and several Marvel universe films.

Whedon, seen here in November 2017, is now 53 and far more successful than when he created "Buffy." He has written, directed and/or produced any number of popular fantasy and sci-fi titles for both film and TV,